A composite manuscript of loose papers and fragments of manuscript volumes. It contains poetry and prose, mostly in Welsh, much of the poetry being addressed to the Owen family of Brogyntyn and Clenennau and other related families. Apart from a late-sixteenth century awdl by Wiliam Llŷn (ff. 57-58), the other items all belong between the first half of the seventeenth century and the first half of the eighteenth century.
Fragments apparently once part of books, some of which perhaps were never bound, are: a narrow folio of cywyddau and englynion by Mathew Owen, in the hand of Nathanael Jones (ff. 20-26), written not before 1656 (see ff. 24 verso-25), with autograph englynion added by Harri Howel (f. 20 verso) and by Nathanael Jones (f. 20 verso, 23); a folio manuscript containing cywyddau to Lewis Anwyl of Parc and his family, dated 1627-1636 (ff. 38-55), written by two good hands of the first half of the seventeenth century, one responsible for ff. 38-50 verso, the other ff. 51-55; a quarto manuscript with transcripts of poetry of the Gogynfeirdd (ff. 113-122; paginated 1-20), by a seventeenth-century hand similar to that of Morris Evans (cf. ff. 93-94, 123-141); pedigrees of Welsh royal lines, the Maurices of Clenennau, etc., in English (ff. 123-141; original foliation 1-12 survives), in the hand of Morris Evans (ff. 123-127 verso, 129-134 verso) and a second hand (ff. 128 recto-verso, 135-141); a narrow folio of canu brud attributed to Myrddin, Taliesin, etc. (ff. 178-186), written by Nathanael Jones, not before 1651 (ff. 182 verso, 183 verso 'aetatis suae a 21o Feb: 1650 27'); a folio manuscript of canu brud, mainly cywyddau, by Dafydd Llwyd and others (ff. 189-207), in a poor hand of the mid seventeenth century, probably that of Thomas Edwards to judge by pentrials on f. 196 verso, who refers to Tregeiriog (f. 199 verso) and 'Llanfylling fairings' (f. 207 verso); an octavo manuscript containing poems by Robin Clidro, etc., in a seventeenth or eighteenth century hand (ff. 210-219); and a folio manuscript of autograph cywyddau and englynion by Huw Morys, some addressed to William Owen and Sir Robert Owen (ff. 222-226 verso). Poetry written on loose papers includes autograph poems by Huw Morys (ff. 12-18), John Owens (ff. 59-71; f. 69 recto-verso may be his italic hand), Harri Howel (ff. 75-76 verso, 90 recto-verso), Owen Gruffydd (ff. 84-89, 230-231), William Phylip (ff. 97-98 verso), John Morgan, later vicar of Conwy (f. 101 recto-verso, the poem incomplete and anonymous, dated 1688, the hand his), Siôn Rhydderch, 1732 (ff. 104-105, 227-228), and Edward Lloyd, Brewis (f. 221 recto-verso). There are probable autograph poems by Edward Rowlant (ff. 72-74 verso, 79-80) and John Richard (f. 81), and possible autograph poems by 'J. Ll.' (f. 26 verso), Mathew Owen (ff. 77-78, 232 recto-verso), Siôn Roberts (ff. 91-92), Huw Cadwaladr (ff. 106-108) and 'R.C.' (f. 163). Other poetry is in the hands of Morris Evans (ff. 93-94) and 'Theo: Ro:' (ff. 152-154 verso). Also included is a letter, 1652, from the antiquary Meredith Lloyd to Thomas Vaughan, the alchemist and poet (ff. 1-3 verso), followed by a copy of Hanes Taliesin (ff. 5-10 verso). The 'Cywydd Marwnad i Mr William Owen o Borkynton' by Huw Morys, beginning 'Mae gwaedd oer lem Gweddw [yw'r wlad]', discussed in E. D. Jones, 'The Brogyntyn Welsh Manuscripts', National Library of Wales Journal, 7 (1951-2), 165-198 (pp. 186-189, 196-197), has not been found.

A composite volume (pp. 1-332; one hundred and sixty-two pages blank) containing miscellaneous notes, lists, extracts, etc., in the hand of Edward Williams ('Iolo Morganwg'). The contents include pp. 13-15, extracts from the manuscript copies of 'Liber Landavensis' in the 'Library of Mr. Davies of Llannerch' [now NLW MS 17110E] and 'in Coll. Jesu, Oxon.' [Jesus College MS 20], including transcripts of the Welsh version of the privilegium of St. Teilo; 21-5, 29-36, extracts from the English version of [William] Camden['s Britannia] relating to the language of the Gauls, with additional notes by Edward Williams himself (see Edmund Gibson (ed.): Britannia . . ., 2nd ed. (London, 1722), Vol. I, cols. xxii-xxix); 69-76, comments on William Owen [Pughe]'s letter on the Welsh language and the Gwentian dialect published in [William] Coxe: [An Historical Tour in] Monmouthshire . . . [(London, 1801), part II, pp. 405-10]; 87-98, historical notes on Welsh literature; 99, 101-03, brief miscellaneous notes on the Silurian, North Wales, Venedotian, and modern literary dialects of Wales, the use of verse amongst the early Greeks, the Ancient Britons, and the early Scandinavians, the mechanical and other skills of the Ancient Britons, and 'Ancient manners still retained in Wales', and brief extracts from one of the published letters of Lady Mary Wortley Montagu from Adrianople, 1718, relating to certain social customs in Turkey; 127, an extract 'Ex Alit yr Odyn MS.' relating to 'Griffine, the sonne of Conane', and an assembly of musicians convened at Caerwissc; 129- 31, extracts from Giraldus Cambrensis: Descriptio Kambriae, book 1, chapters 3, 12, 13, referring to the genealogies of the princes of Wales, the musical instruments of the Welsh, their bards, etc.; 138, 143-6, 148-9, 151, 153, 178-203, 231-46, 249-69, lists of Welsh words of a specific nature grouped together under descriptive headings ('Enwau Duw', 'Enwau Duw - Barddas', 'Walicized Roman Names', 'Geiriau sathredig yng Ngwent'), lists of Welsh words of a more general nature and of Welsh phrases, mainly poetic or bardic, sometimes with English definitions and/or illustrative excerpts from the works of Welsh poets, miscellaneous etymological and grammatical notes on the Welsh language, etc.; 159-72, lists of Welsh 'wisdom sayings' including lists with the superscriptions 'Llyma eiriae Gwynda Hen', 'Llyma eiriae Selyf dhoeth', 'Llyma gynghorau Catto Ddoeth ag Ystudfach Fardd a'r Bardd Glas o'r Gadair . . .', and 'Llyma Gynghorion y Doethion'; 207-08, notes headed 'Peculiarities of Dr. R[ichar]d Davies New Testament'; 247-9, a list of 'Welsh Agricultural Terms in Glamorgan'; 283- 6, 292-3, notes on Welsh bardic rites and ceremonies; 289-91, notes on Welsh poetic metres headed 'Llyma fal y mae Lewys Morganwg yn son am y mesurau Cerdd Dafawd a'u dosparth yn y Llyfr Cerddwriaeth a wnaeth efe Yr Arglwydd Wiliam Herbert, Iarll Rhaglan'; 311-13, notes on the metrical foot in Welsh verse headed 'Llyma Gorfannau cerdd dafawd'; 314-15, further notes on the same topic headed 'Llyma fal y mae am y Corfannau yn Llyfr Owain ap Rhydderch o Dresigyn'; and 316-21, comments on some of the Welsh strict metres, notes on the type of poem called a 'carol neu ddyrif, a elwid cerdd deuluaidd gan yr hen athrawon', and notes on an assembly of bards convened by King Arthur at Caerleon ('Llyma son am Gadair Arthur o Lyfr Rhys Brydydd o Dir Iarll').

'Alphabet of Pedegres of diverse kings, dukes, marques, erles, vicounts, barons, knights, squires and gentlemen of Englande, ffraunce, Ireland, Scotland and wales', compiled by A. Lewis, with an index in a later hand. The compiler refers to several well-known authorities, including 'Thomas Joones de Tregaron generosus'.

A volume in the hand of Mary Richards, Darowen containing '[C]ronicl y Tywysogion Cymry' (cf. Thomas Jones: Brut y Tywysogion (Cardiff, 1955), pp. 2-24); Welsh and other pedigrees, e.g. of Queen Victoria, King George IV, Gr. ap Kynan, Rhys ap Tewdwr, Lewis ap Owen (Dolgelley), Edmund Meyrick (Ucheldre), Llywelyn ap Gruffydd, Grono Fychan, William Pughe (Mathafarn), the family of Hendre Mur (Maentwrog), Robert Mostyn, the family of Salisbury, Sir Lewis Trelawny, the family of Breubwyll (Llanbedr, Merioneth), Cathrine Lloyd (Abercydill, Cemmes, Montgomeryshire), Oliver Cromwell, etc., and pedigrees from printed sources; a table of British kings entitled 'Tabl o holl Frenhinoedd Brydain, or Penaithiaid cyntaf hyd at ein Brenin George III ... a breintiwyd yn Almanac Mr Thomas Jones am y flwyddyn 1709 ... '; a table of the princes of South Wales entitled 'Cofrestr o Dywysogion Deheubarth y rhai oedd yn Cadw eu Llys yn Nhastell [sic] Dinevwr... '; poetry in strict metres ('awdlau' 'cywyddau', and especially 'englynion') by Gutto'r Glyn, Gruffyth Philip, William Llyn, Tudur Aled, Owen Gryffyth, Wiliam Philip, Owen Gwynedd, Robert Parry ('Robyn Ddu Eryri'), Robert Llwydd [sic], Huw Wiliams, Lewis Mon, Dafydd Llwyd ap Llewelyn ap Gruffydd, Dafydd Richards ('Dewi Silin'), Sion Cain, Morys Thomas ap Hywel, Huw Arwystl, Sir Owen ap Gwilym, Hugh Llwyd, Sion Philip, Sion Tudur, [John Jones] ('Myllin'), [Moris Jones] ('Meurig Idris'), Robert Davies ('Bardd Nantglyn'), Ieuan Gethin ap Ie'n ap Ll'in, William Miltwn, Richard Humphreys (Llanfair [Caereinion]), Gr[uffudd] ab Gr[uffudd], Llywelyn Goch Ameiric hen, Edmund Prys (Archddiagon Meirionydd), 'Sion Gwnfa', Iolo Goch, Raff ab Robert, [William Williams] ('Gwilym ab Ierwerth'), [Thomas Edwards] ('Twm o'r Nant'), Sr Ifan Llwyd Offeiriad, Walter Davies ('Gwallter Mechain'), [David Humphreys] ('Dewi Bardd Einion'), (J. W. Hughes] ('Edeyrn o Fôn'), Llywelyn ap Gutto, Hugh Moris, Taliesin, Ifan Jones ('Ieuan Gwynedd'), John Blackwell ['Alun'], [Robert Jones] ('Bardd Mawddach'), [William Edwards] ('Gwilym Padarn'), [Benjamin iones] ('P. A. Môn'), Cadwaladr Dafydd, Evan Evans ('[Ieuan] Glan Geirionydd'), [Rowland Parry] ('Ieuan Carn Dochan'), [William Ellis Jones] ('G[wilym] Cawrdaf'), [John Athelstan Owen] ('Bardd Meirion'), Robert Parry (Eglwysfach), James Dwnyd, Aneurin Owain, [William Williams] ('G[wilym] Cyfeiliog'), (David Richards] ('Dafydd Ionawr') John Parry, John Llwyd ('o Halfen'), etc., and anonymous poems; poetry in free metres by Dafydd Jones ('y Tailiwr hir'), Edmund Prys (Archddiacon Meirionydd), William Phylip, Elis Edward, John Hughes (Llanbadarn Fawr) ('Ioan Glaslwyn', 'Ioan Min Mochno', 'Bardd Ystwyth'), Thomas Ellis ('Bardd Caerwys'), Sion Tudur, John Edward, Evan Evans ('[Ieuan] Glan Geirionydd'), Dafydd Rees ('Saer Coed', Llanbryn Mair), Dafidd Cadwal[a]dr (Llan y Mowddwy), Sion Prys ('o Fowddwy'), [David Jones] 'Ieuan Cadfan', D. Davies (curate Llan y Blodwell), [Benjamin Jones] ('P. A. Môn'), [John Jones] ('Ioan Tegid'), D. Humphreys ('Dewi Einion'), Thomas Jones (Creaton), etc., and anonymous poems; ' ... henwau pymtheg llwyth Gwynedd'; extracts from John Reynolds: 'A true statement of all the Decendant[s] of the late David Llwyd Boneddwr of Cymmerau in the Parish of Llanbadarn fawr in the County of Cardigan' [grandfather of Mary Richards]; accounts of 'plygain' services at Darowen, Llangynyw and Llan Erful during the period 1842-70; 'Constitua seu Edicta antiquitus in usum Bardorum & Musicorum praescripta. Braint arr wyr gerdd drwy waith Tywyssogion Cymry ...'; ' ... Compownd Manwel' by Dafydd Nanmor; an account of trilobites, seals, etc. in the possession of Mary Richards, 1863-5: personal memoranda by Mary Richards; letters from Thomas Richards, Darowen to his children at the Wrexham eisteddfod, 1823 (personal), [ ] to M[ary] Richards, undated (enclosing nuts, the felling of the largest sycamore tree in the country in the churchyard at Llan y Mowddwy), [Griffith Jones] ('Gruffydd Glan Gwynion') [Dolgellau] to Mair Richards, Darowen, undated (a gift of two books to the recipient, London Eisteddfod) (two copies), W[illiam] Edwards ('Gwilym Padarn'), Llanberis to [Mary] Richards, Llangynyw, 1829 (the proposed publication of Eos Padarn), J. Blackwell ['Alun'], Rhydychain to M[ary] Richards, Darowain, 1824 (an enclosed stanza by 'Tegid'), [Daniel Evans]) 'Daniel Ddu [o Geredigion']) to Mair Richards, Darowain, 1830 (the proposed publication of Gwinllan y Bardd), John Evan[s], secretary, Cymmrodorion or Metropolitan Cambrian Institution to [Mary Richards], 1821 (the election of addressee to honorary membership of the Society), and Elizabeth Richards, Darowen, to Miss [ ] Gardner, 1824 (the antiquarian and other interests of the writer's sister [Mary], an old seal given to [Mary] by the addressee); a portion of a bardic grammar entitled 'Dosparth y llyfr Cynta or Pump llyfr Cerddwriaeth Cerdd dafod'; 'Enwau y Gwyr Ieuang a ddysgodd i ganu'r Bibell neu y Flute Germanaidd Gan Mair Richard Ofyddes Darowen, hithau a ddysgasai ei deall gan ei Brawd Dewi Sillin ... '; accounts of the tithe corn of Darowen, 1591-2; armorial bearings (Gwent, Carmarthenshire, etc.); a list of twenty-two books of pedigree ('Llyfrau Ach') of King Edward VI; a list of twenty-four 'cromlechi' [in Anglesey] ('Cofrestr or Cromlechau neu allorau Derwyddion'); 'Hyd a lled a chwmpas y Ddaear ai Thewdwr'; etc. Among the sources quoted by the scribe are a manuscript of Angharad Llwyd (p. 316) and 'Llyfyr Moelyrch Llansilin' (p. 368).